.header{
    width: 100%;
    height: 70px;
    border-bottom: 1px solid #eee;
    font-size: 18px;
    color: #333;
    text-align: center;
    line-height: 70px;
    position: relative;
    .back {
        position: absolute;
        left: 20px;
        top: 2px;
        font-size: 14px;
        color: #005aa0;
    }
    .login {
        position: absolute;
        right: 20px;
        top: 2px;
        font-size: 14px;
        color: #005aa0;
    }
}